My buddy has an scion XB and has decided to toss a wall in the back.  

He works at CC and got 4mtx 7500s 15s and a pair of 1500s to power it for like nothing.  

I have have two questions for you guys...   anyone work with the 7500s?  If so what kinda enclosure should we build?  Sealed, ported?  I am not all about experimenting and I was just gonna toss them in like 3.5-4cf each with like 40-50" or so of port area a piece.  Tune em to like 34 and see what the hell happens.  

Also, anyone toss a wall in the xB and have any tips for me?  I start in two mondays.

sounds like quite a project...i saw a Scion XB with a wall in it...it was a distributors Rockford car...4 15" T2s and that one huge rockford amp...the 4000 watt one( can't think of the name of it...very clean install but it could have used  some batteries cause there were NONE!

is this a daily driver set up or straight spl?
daily i assume?

thanks marshoo...   ill use your advice.  I wonder if there is a way I could cut wieght in this thing.  that scion has no HP.  ill post pics when the chaos begins

ill def. listen to marshoo... i think he has built a few walls in his day.  

my buddy is all about pretty stuff so we will see how he trims it all out.  I am just the box design guy.

Never tossed together a double thick box before, but I am sure it wont be much of a problem.  My buddy an I are both little guys, so maybe this wall will go together as two boxes.... make it easier to handle.  Bolt them together seperately?

unfortunatly building a wall is never the same thing twice.
So you can't just say 40x30x36 double thick and go.
Sometimes the contour of the space for it to go in is just not forgiving and you have to take extra time just to get a good flat spot just to start in.
So I can't just give you a formula and go at it.

basically step one......figure out how close you want it.
Get in the scion and pimp lean the seats back to hand job position.
and put the wall right behind that.
...might as well right?
Why sacrifice the sexy time?

So after that you have to make the "dance floor" ...that has to be rock solid and capable of being drilled and bolted from the chassis up to the bottom floor of the wall enclosure.
DO NOT HALF ASS THIS.....
A wall can come at you if not bolted down...
A collision at 40 mph may not kill you ...but it will if the wall comes unattached and chases you into the steering wheel.

Then its back to construction.... 2x thick on everything and make a baffle as thick as you can..... 4x minimum....sky is the limit....and then you can either leave the back wall 2x or you can 2x and use 2x4's...2x4s are light and rigid and add a ton of support to the back wall.

Put 45degree angle peices in the corners.
Glass if you want too..
Round off the edges...
All thread the box to decrease flex ... flex = loss of spl waste of power and performance.  When using allthread....use washers and 2 nuts together on both sides of wood...this is called JAMNUTTING...the first nut holds place and the 2nd nut jams the other one so it doesn't move after the funk is applied.

The it is always a good idea to allthread from back wall to somewhere behind the box to help keep it stable incase of an accident.
I cannot stress this enough.
95honda foamed his wall in...that is basically fool proof...but 85% of people that try to do that will screw up and bulge their bulkheads out and have a big goofy looking bulged panel car from then on.

the rest is basically up to you....that is the basic layout of a good box...construction iand safety is what will make or break you.
If you suck at building, not amount of advise i give is going to be worth a crap.


take pics along the way and we can guide you to the right direction.
Also..if you do want to glass it...gravity is your friend.
Build the enclosure outside of the car....
And glass out in the open air ...being able to lay the enclosure on the sides you are glassing is invaluable.

I think you would want to put trim pieces all around in that case.  Otherwise you would defeat the purpose and benefits of the thing.